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Cardano (ADA) looks more promising for the DeFi applications. It's better designed and written in a safer, purer language (Haskell).

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"It's better designed" - that's a very subjective comment.

There are already a bunch of other chains that do what ADA seeks to do like Tezos, Polkadot, and Solana. Why haven't those gained traction?

Also, while it does make dapps safer, the lack of functional programming experience in most programmers makes it diffcult for me to think Cardano will do any better.

Polkadot certainly gained traction recently - together with Cardano they occupy 3 and 4 places on market capitalization if you exclude Tether[1].

[1] https://coinmarketcap.com/

Market cap is not adoption. Look at how many projects that were in the top 20 in 2017 that aren't the anymore. LSK, Neo, EOS, NEM, OMG, DASH, BTG....goes on and on

Cardano doesn't have smart contracts yet, and with Metcalfe's Law and network effects, Ethereum is already leading with DeFi.

They are almost there with Plutus[1][2] and Marlowe[3].

[1] https://docs.cardano.org/projects/plutus/en/latest/

[2] https://github.com/input-output-hk/plutus

[3] https://docs.cardano.org/en/latest/marlowe/marlowe-explainer...

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